In the human town of Zetsuya, Makoto and company meet a girl named Rinon who is searching for her missing sister. That night, they're attacked at the inn. They learn Rinon's sister Toa is being held captive because of her debt. As Makoto nearly loses his cool for certain reasons, Tomoe and Mio go to rescue Toa instead. However, a single man stands in their way.

A mysterious explosion occurs in the demiplane, and Tomoe collapses. Though Makoto is unsettled by the sudden events, he heads to the site of the explosion in order to treat the wounded. Makoto is shocked to learn the denizens of the demiplane were harmed in the explosion. Meanwhile, he learns the truth from the hyuman memory that enters his mind! What will Makoto do once he discovers the selfish actions they took?!